Commitments and Contingencies Commitments and Contingencies, Changes in Environmental Contingencies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	$ 19.3	$ 22.8	$ 21.7
Additional accruals	1.3	0.8	4.5
Less expenditures	2.0	4.3	3.4
Ending balance	$ 18.6	$ 19.3	$ 22.8